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【单选题】
点作曲线运动时,“匀变速运动”指的是( )。
A.
全加速度a是常矢量
B.
切向加速度at是常矢量
C.
法向加速度an是常矢量
D.
切向加速度at的大小是常量
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【单选题】腋窝和肩部出血,可用拇指压迫同侧锁骨上窝中部的锁骨下动脉。()
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B.
【单选题】Music and Driving Listening to loud music while driving can seriously hamper reaction times and cause accidents, new research suggests. A Canadian study found people took up to 20% longer to perform. ...
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A.
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B.
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C.
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D.
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【判断题】腋窝和肩部出血,可用拇指压迫同侧锁骨上窝中部的锁骨下动脉。
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A.
painful
B.
potential
C.
probable
D.
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